llvm/test/Transforms/LoopStrengthReduce/wrong-hoisting-iv.ll

; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
; RUN: opt -S -loop-reduce < %s | FileCheck %s

; These are regression tests for PR43768.
target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-f80:128-n8:16:32:64-S128"

; Test checks that LSR does not hoist increment of %val9 while expanding the other pieces of formula
; to original place in backedge causing incorrect SSA form.
define void @test1() {
; CHECK-LABEL: @test1(
; CHECK-NEXT:  bb:
; CHECK-NEXT:    [[VAL:%.*]] = load i32, ptr addrspace(3) undef, align 4
; CHECK-NEXT:    [[VAL1:%.*]] = add i32 undef, 12
; CHECK-NEXT:    [[VAL2:%.*]] = trunc i64 undef to i32
; CHECK-NEXT:    [[VAL3:%.*]] = mul i32 [[VAL1]], [[VAL2]]
; CHECK-NEXT:    [[VAL4:%.*]] = sub i32 [[VAL]], [[VAL3]]
; CHECK-NEXT:    [[VAL5:%.*]] = ashr i32 undef, undef
; CHECK-NEXT:    [[VAL6:%.*]] = sub i32 [[VAL4]], [[VAL5]]
; CHECK-NEXT:    [[TMP2:%.*]] = mul i32 [[VAL]], 7
; CHECK-NEXT:    [[TMP3:%.*]] = mul i32 [[VAL5]], 7
; CHECK-NEXT:    [[TMP4:%.*]] = sub i32 [[TMP2]], [[TMP3]]
; CHECK-NEXT:    [[TMP5:%.*]] = shl i32 [[VAL6]], 3
; CHECK-NEXT:    br label [[BB7:%.*]]
; CHECK:       bb7:
; CHECK-NEXT:    [[LSR_IV1:%.*]] = phi i32 [ [[LSR_IV_NEXT2:%.*]], [[BB32:%.*]] ], [ 0, [[BB:%.*]] ]
; CHECK-NEXT:    [[LSR_IV:%.*]] = phi i64 [ [[LSR_IV_NEXT:%.*]], [[BB32]] ], [ -8, [[BB]] ]
; CHECK-NEXT:    [[LSR_IV_NEXT]] = add nsw i64 [[LSR_IV]], 8
; CHECK-NEXT:    [[LSR_IV_NEXT2]] = add nuw nsw i32 [[LSR_IV1]], [[TMP5]]
; CHECK-NEXT:    [[VAL10:%.*]] = icmp ult i64 [[LSR_IV_NEXT]], 65536
; CHECK-NEXT:    br i1 [[VAL10]], label [[BB12:%.*]], label [[BB11:%.*]]
; CHECK:       bb11:
; CHECK-NEXT:    unreachable
; CHECK:       bb12:
; CHECK-NEXT:    [[VAL14:%.*]] = icmp slt i32 undef, undef
; CHECK-NEXT:    br i1 [[VAL14]], label [[BB17:%.*]], label [[BB12_BB15SPLITSPLITSPLITSPLITSPLIT_CRIT_EDGE:%.*]]
; CHECK:       bb15splitsplitsplitsplitsplitsplit:
; CHECK-NEXT:    br label [[BB15SPLITSPLITSPLITSPLITSPLIT:%.*]]
; CHECK:       bb12.bb15splitsplitsplitsplitsplit_crit_edge:
; CHECK-NEXT:    [[TMP6:%.*]] = add i32 [[VAL6]], [[LSR_IV1]]
; CHECK-NEXT:    br label [[BB15SPLITSPLITSPLITSPLITSPLIT]]
; CHECK:       bb15splitsplitsplitsplitsplit:
; CHECK-NEXT:    [[VAL16_PH_PH_PH_PH_PH:%.*]] = phi i32 [ [[TMP6]], [[BB12_BB15SPLITSPLITSPLITSPLITSPLIT_CRIT_EDGE]] ], [ [[VAL35:%.*]], [[BB15SPLITSPLITSPLITSPLITSPLITSPLIT:%.*]] ]
; CHECK-NEXT:    br label [[BB15SPLITSPLITSPLITSPLIT:%.*]]
; CHECK:       bb17.bb15splitsplitsplitsplit_crit_edge:
; CHECK-NEXT:    [[TMP7:%.*]] = shl i32 [[VAL]], 1
; CHECK-NEXT:    [[TMP8:%.*]] = mul i32 [[VAL1]], [[VAL2]]
; CHECK-NEXT:    [[TMP9:%.*]] = shl i32 [[TMP8]], 1
; CHECK-NEXT:    [[TMP10:%.*]] = sub i32 [[TMP7]], [[TMP9]]
; CHECK-NEXT:    [[TMP11:%.*]] = shl i32 [[VAL5]], 1
; CHECK-NEXT:    [[TMP12:%.*]] = sub i32 [[TMP10]], [[TMP11]]
; CHECK-NEXT:    [[TMP13:%.*]] = add i32 [[TMP12]], [[LSR_IV1]]
; CHECK-NEXT:    br label [[BB15SPLITSPLITSPLITSPLIT]]
; CHECK:       bb15splitsplitsplitsplit:
; CHECK-NEXT:    [[VAL16_PH_PH_PH_PH:%.*]] = phi i32 [ [[TMP13]], [[BB17_BB15SPLITSPLITSPLITSPLIT_CRIT_EDGE:%.*]] ], [ [[VAL16_PH_PH_PH_PH_PH]], [[BB15SPLITSPLITSPLITSPLITSPLIT]] ]
; CHECK-NEXT:    br label [[BB15SPLITSPLITSPLIT:%.*]]
; CHECK:       bb20.bb15splitsplitsplit_crit_edge:
; CHECK-NEXT:    [[TMP14:%.*]] = mul i32 [[VAL]], 3
; CHECK-NEXT:    [[TMP15:%.*]] = mul i32 [[VAL1]], [[VAL2]]
; CHECK-NEXT:    [[TMP18:%.*]] = mul i32 [[VAL5]], 3
; CHECK-NEXT:    [[TMP19:%.*]] = sub i32 [[TMP14]], [[TMP18]]
; CHECK-NEXT:    [[TMP20:%.*]] = add i32 [[TMP19]], [[LSR_IV1]]
; CHECK-NEXT:    br label [[BB15SPLITSPLITSPLIT]]
; CHECK:       bb15splitsplitsplit:
; CHECK-NEXT:    [[VAL16_PH_PH_PH:%.*]] = phi i32 [ [[TMP20]], [[BB20_BB15SPLITSPLITSPLIT_CRIT_EDGE:%.*]] ], [ [[VAL16_PH_PH_PH_PH]], [[BB15SPLITSPLITSPLITSPLIT]] ]
; CHECK-NEXT:    br label [[BB15SPLITSPLIT:%.*]]
; CHECK:       bb23.bb15splitsplit_crit_edge:
; CHECK-NEXT:    [[TMP21:%.*]] = shl i32 [[VAL]], 2
; CHECK-NEXT:    [[TMP22:%.*]] = mul i32 [[VAL1]], [[VAL2]]
; CHECK-NEXT:    [[TMP23:%.*]] = shl i32 [[TMP22]], 2
; CHECK-NEXT:    [[TMP24:%.*]] = sub i32 [[TMP21]], [[TMP23]]
; CHECK-NEXT:    [[TMP25:%.*]] = shl i32 [[VAL5]], 2
; CHECK-NEXT:    [[TMP26:%.*]] = sub i32 [[TMP24]], [[TMP25]]
; CHECK-NEXT:    [[TMP27:%.*]] = add i32 [[TMP26]], [[LSR_IV1]]
; CHECK-NEXT:    br label [[BB15SPLITSPLIT]]
; CHECK:       bb15splitsplit:
; CHECK-NEXT:    [[VAL16_PH_PH:%.*]] = phi i32 [ [[TMP27]], [[BB23_BB15SPLITSPLIT_CRIT_EDGE:%.*]] ], [ [[VAL16_PH_PH_PH]], [[BB15SPLITSPLITSPLIT]] ]
; CHECK-NEXT:    br label [[BB15SPLIT:%.*]]
; CHECK:       bb26.bb15split_crit_edge:
; CHECK-NEXT:    [[TMP28:%.*]] = mul i32 [[VAL]], 5
; CHECK-NEXT:    [[TMP29:%.*]] = mul i32 [[VAL1]], [[VAL2]]
; CHECK-NEXT:    [[TMP32:%.*]] = mul i32 [[VAL5]], 5
; CHECK-NEXT:    [[TMP33:%.*]] = sub i32 [[TMP28]], [[TMP32]]
; CHECK-NEXT:    [[TMP34:%.*]] = add i32 [[TMP33]], [[LSR_IV1]]
; CHECK-NEXT:    br label [[BB15SPLIT]]
; CHECK:       bb15split:
; CHECK-NEXT:    [[VAL16_PH:%.*]] = phi i32 [ [[TMP34]], [[BB26_BB15SPLIT_CRIT_EDGE:%.*]] ], [ [[VAL16_PH_PH]], [[BB15SPLITSPLIT]] ]
; CHECK-NEXT:    br label [[BB15:%.*]]
; CHECK:       bb29.bb15_crit_edge:
; CHECK-NEXT:    [[TMP35:%.*]] = mul i32 [[VAL]], 6
; CHECK-NEXT:    [[TMP36:%.*]] = mul i32 [[VAL1]], [[VAL2]]
; CHECK-NEXT:    [[TMP37:%.*]] = mul i32 [[TMP36]], 6
; CHECK-NEXT:    [[TMP38:%.*]] = sub i32 [[TMP35]], [[TMP37]]
; CHECK-NEXT:    [[TMP39:%.*]] = mul i32 [[VAL5]], 6
; CHECK-NEXT:    [[TMP40:%.*]] = sub i32 [[TMP38]], [[TMP39]]
; CHECK-NEXT:    [[TMP41:%.*]] = add i32 [[TMP40]], [[LSR_IV1]]
; CHECK-NEXT:    br label [[BB15]]
; CHECK:       bb15:
; CHECK-NEXT:    [[VAL16:%.*]] = phi i32 [ [[TMP41]], [[BB29_BB15_CRIT_EDGE:%.*]] ], [ [[VAL16_PH]], [[BB15SPLIT]] ]
; CHECK-NEXT:    call void @widget() [ "deopt"(i32 [[VAL16]], i32 3, i32 [[VAL]]) ]
; CHECK-NEXT:    unreachable
; CHECK:       bb17:
; CHECK-NEXT:    [[VAL19:%.*]] = icmp slt i32 undef, undef
; CHECK-NEXT:    br i1 [[VAL19]], label [[BB20:%.*]], label [[BB17_BB15SPLITSPLITSPLITSPLIT_CRIT_EDGE]]
; CHECK:       bb20:
; CHECK-NEXT:    [[VAL22:%.*]] = icmp slt i32 undef, undef
; CHECK-NEXT:    br i1 [[VAL22]], label [[BB23:%.*]], label [[BB20_BB15SPLITSPLITSPLIT_CRIT_EDGE]]
; CHECK:       bb23:
; CHECK-NEXT:    [[VAL25:%.*]] = icmp slt i32 undef, undef
; CHECK-NEXT:    br i1 [[VAL25]], label [[BB26:%.*]], label [[BB23_BB15SPLITSPLIT_CRIT_EDGE]]
; CHECK:       bb26:
; CHECK-NEXT:    [[VAL28:%.*]] = icmp slt i32 undef, undef
; CHECK-NEXT:    br i1 [[VAL28]], label [[BB29:%.*]], label [[BB26_BB15SPLIT_CRIT_EDGE]]
; CHECK:       bb29:
; CHECK-NEXT:    [[VAL31:%.*]] = icmp slt i32 undef, undef
; CHECK-NEXT:    br i1 [[VAL31]], label [[BB32]], label [[BB29_BB15_CRIT_EDGE]]
; CHECK:       bb32:
; CHECK-NEXT:    [[TMP42:%.*]] = add i32 [[TMP4]], [[LSR_IV1]]
; CHECK-NEXT:    [[VAL35]] = add i32 [[TMP42]], [[VAL6]]
; CHECK-NEXT:    br i1 false, label [[BB7]], label [[BB15SPLITSPLITSPLITSPLITSPLITSPLIT]]
;
bb:
  %val = load i32, ptr addrspace(3) undef, align 4
  %val1 = add i32 undef, 12
  %val2 = trunc i64 undef to i32
  %val3 = mul i32 %val1, %val2
  %val4 = sub i32 %val, %val3
  %val5 = ashr i32 undef, undef
  %val6 = sub i32 %val4, %val5
  br label %bb7

bb7:                                              ; preds = %bb32, %bb
  %val8 = phi i64 [ 0, %bb ], [ %val34, %bb32 ]
  %val9 = phi i32 [ 0, %bb ], [ %val35, %bb32 ]
  %val10 = icmp ult i64 %val8, 65536
  br i1 %val10, label %bb12, label %bb11

bb11:                                             ; preds = %bb7
  unreachable

bb12:                                             ; preds = %bb7
  %val13 = add i32 %val9, %val6
  %val14 = icmp slt i32 undef, undef
  br i1 %val14, label %bb17, label %bb15

bb15:                                             ; preds = %bb32, %bb29, %bb26, %bb23, %bb20, %bb17, %bb12
  %val16 = phi i32 [ %val35, %bb32 ], [ %val30, %bb29 ], [ %val27, %bb26 ], [ %val24, %bb23 ], [ %val21, %bb20 ], [ %val18, %bb17 ], [ %val13, %bb12 ]
  call void @widget() [ "deopt"(i32 %val16, i32 3, i32 %val) ]
  unreachable

bb17:                                             ; preds = %bb12
  %val18 = add i32 %val13, %val6
  %val19 = icmp slt i32 undef, undef
  br i1 %val19, label %bb20, label %bb15

bb20:                                             ; preds = %bb17
  %val21 = add i32 %val18, %val6
  %val22 = icmp slt i32 undef, undef
  br i1 %val22, label %bb23, label %bb15

bb23:                                             ; preds = %bb20
  %val24 = add i32 %val21, %val6
  %val25 = icmp slt i32 undef, undef
  br i1 %val25, label %bb26, label %bb15

bb26:                                             ; preds = %bb23
  %val27 = add i32 %val24, %val6
  %val28 = icmp slt i32 undef, undef
  br i1 %val28, label %bb29, label %bb15

bb29:                                             ; preds = %bb26
  %val30 = add i32 %val27, %val6
  %val31 = icmp slt i32 undef, undef
  br i1 %val31, label %bb32, label %bb15

bb32:                                             ; preds = %bb29
  %val33 = add i32 %val30, %val6
  %val34 = add nuw nsw i64 %val8, 8
  %val35 = add i32 %val33, %val6
  br i1 false, label %bb7, label %bb15
}

; Test checks that LSR does not hoist increment of %val8 while expanding the other pieces of formula
; to original place in backedge causing incorrect SSA form.
define void @test2() {
; CHECK-LABEL: @test2(
; CHECK-NEXT:  bb:
; CHECK-NEXT:    [[VAL1:%.*]] = load i32, ptr null, align 4
; CHECK-NEXT:    [[VAL3:%.*]] = load i32, ptr null, align 4
; CHECK-NEXT:    br label [[BB6:%.*]]
; CHECK:       bb4:
; CHECK-NEXT:    [[VAL5:%.*]] = sext i32 [[VAL16:%.*]] to i64
; CHECK-NEXT:    unreachable
; CHECK:       bb6:
; CHECK-NEXT:    [[LSR_IV:%.*]] = phi i64 [ [[LSR_IV_NEXT:%.*]], [[BB12:%.*]] ], [ -1, [[BB:%.*]] ]
; CHECK-NEXT:    [[VAL8:%.*]] = phi i32 [ [[VAL16]], [[BB12]] ], [ [[VAL3]], [[BB]] ]
; CHECK-NEXT:    [[LSR_IV_NEXT]] = add nsw i64 [[LSR_IV]], 1
; CHECK-NEXT:    [[VAL10:%.*]] = icmp ult i64 [[LSR_IV_NEXT]], 1048576
; CHECK-NEXT:    br i1 [[VAL10]], label [[BB12]], label [[BB11:%.*]]
; CHECK:       bb11:
; CHECK-NEXT:    unreachable
; CHECK:       bb12:
; CHECK-NEXT:    [[VAL14:%.*]] = add i32 [[VAL8]], [[VAL1]]
; CHECK-NEXT:    [[VAL15:%.*]] = select i1 false, i32 [[VAL14]], i32 [[VAL8]]
; CHECK-NEXT:    [[VAL16]] = add i32 [[VAL14]], 1
; CHECK-NEXT:    [[VAL17:%.*]] = fcmp olt double 0.000000e+00, 2.270000e+02
; CHECK-NEXT:    br i1 [[VAL17]], label [[BB6]], label [[BB4:%.*]]
;
bb:
  %val1 = load i32, ptr null, align 4
  %val3 = load i32, ptr null, align 4
  br label %bb6

bb4:                                              ; preds = %bb12
  %val5 = sext i32 %val16 to i64
  unreachable

bb6:                                              ; preds = %bb12, %bb
  %val7 = phi i64 [ %val9, %bb12 ], [ 0, %bb ]
  %val8 = phi i32 [ %val16, %bb12 ], [ %val3, %bb ]
  %val9 = add nuw nsw i64 %val7, 1
  %val10 = icmp ult i64 %val7, 1048576
  br i1 %val10, label %bb12, label %bb11

bb11:                                             ; preds = %bb6
  unreachable

bb12:                                             ; preds = %bb6
  %val13 = select i1 false, i32 0, i32 %val8
  %val14 = add i32 %val8, %val1
  %val15 = select i1 false, i32 %val14, i32 %val13
  %val16 = add i32 %val14, 1
  %val17 = fcmp olt double 0.000000e+00, 2.270000e+02
  br i1 %val17, label %bb6, label %bb4
}

declare void @widget()